Noble gases in the howardites Bholghati and Kapoeta

Journal Article · Wed Aug 01 04:00:00 EDT 1990 · Geochimica et Cosmochimica Acta; (USA)

DOI:https://doi.org/10.1016/0016-7037(90)90044-L· OSTI ID:6205389

Swindle, T D ^[1]; Garrison, D H; Hohenberg, C M; Nichols, R H; Olinger, C T ^[2]; Goswami, J N ^[3]

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1. Univ. of Arizona, Tucson (USA)
2. Washington Univ., St. Louis, MO (USA)
3. Physical Research Laboratory, Ahmedabad (India)

Analyses of noble gases in whole rock samples of the howardites Bholghati and Kapoeta and grain-size separates of Kapoeta yield evidence for excesses of the Xe isotopes {sup 129}Xe, {sup 131}Xe, {sup 132}Xe, {sup 134}Xe, and {sup 136}Xe in a low-temperature component, similar to lunar excess fission Xe. Such a component may be able to provide chronometric information if the relative abundances of radioactive progenitors ({sup 129}I, {sup 244}Pu, and {sup 238}U) can be determined, but the isotopic spectra we obtain are not sufficiently precise to do so. Eucritic clast BH-5 in Bholghati contains Xe produced in situ by the decay of {sup 244}Pu. Calculated fission Xe retention ages are 30-70 Ma after the formation of the solar system, consistent with the apparent presence of {sup 146}Sm decay products. Both the clast and the matrix of Bholghati have K-Ar ages of about 2 Ga, suggesting a common thermal event at least that recently.

• OSTI ID: 6205389
• Journal Information: Geochimica et Cosmochimica Acta; (USA), Journal Name: Geochimica et Cosmochimica Acta; (USA) Vol. 54:8; ISSN GCACA; ISSN 0016-7037
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
640106 -- Astrophysics & Cosmology-- Cosmology
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
AGE ESTIMATION
ALPHA DECAY RADIOISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHEMICAL COMPOSITION
CHONDRITES
DAUGHTER PRODUCTS
DAYS LIVING RADIOISOTOPES
DECAY
ELEMENTS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FLUIDS
GASES
GEOLOGIC HISTORY
HEAVY NUCLEI
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IODINE 129
IODINE ISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPE DATING
ISOTOPE RATIO
ISOTOPES
METEORITES
NONMETALS
NUCLEI
ODD-EVEN NUCLEI
PETROCHEMISTRY
PETROGENESIS
PLUTONIUM 244
PLUTONIUM ISOTOPES
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
RARE GASES
SAMARIUM 146
SAMARIUM ISOTOPES
STABLE ISOTOPES
STONE METEORITES
URANIUM 238
URANIUM ISOTOPES
XENON 129
XENON 131
XENON 132
XENON 134
XENON 136
XENON ISOTOPES
YEARS LIVING RADIOISOTOPES